Quote Originally Posted by SadieKate
Thanks all. I just downloaded the instructions for the digital Graco imonitor. It says you can change channels to find the least interference. I'm assuming that I could buy two pairs and set both to the same channel to give us 4 units operating on the same channel.

I can buy a version with two parental units but it only has one baby unit. In this case, the "baby" is mobile and won't remember to carry his monitor with him. I think the two pairs will be best of I can set both to the same channel/frequency.

Unless they work differently than a decade ago, you should be able to hear from any of the units.

4 units will definately pick up any noise.

Edited: Just saw the price-wow times they are a changing...mine were maybe $10 and I thought that was a lot. (off I go repeating, I am not getting old....)